Appeal No. 1998-1369
Application No. 08/622,620
class of mercaptans contain about five to thirty carbon atoms
and reduces the tendency of mineral lubricating oils to
deteriorate in the presence of oxygen while greatly inhibiting
the normal corrosiveness of such lube oils towards copper
bearings widely used in automotive engines (page 1, left col.,
ll. 6-23). Hill discloses that long chain (about 10 to about
30 carbon atoms), primary aliphatic mercaptans act as lead
dispersants in lubricants and also demonstrate potent bearing
corrosion inhibiting properties (col. 1, ll. 30-37 and 54).
Michaelis discloses mercaptans of formula (I) with 8 to 30
carbon atoms useful as antiwear or extreme pressure agents for
addition to lubricants (col. 1, ll. 7-11; col. 1, l. 58-col.
2, l. 17).
The examiner further finds that each reference teaches
that the mercaptan additive may be combined with other well-
known lubricating oil additives (Answer, pages 3-4). See Eby,
page 3, right col., ll. 30-61, where Eby teaches the
advantageous combination of the mercaptan additives with other
addition agents, specifically listing several classes of
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